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There were many Minnie Henderson's in the U. S. Censuses.
Therefore, I'd request a copy of her obituary from volunteers at Random Acts Genealogical Kindness, www.raogk.org, read instructions, choose Oregon, choose Clackamas County.
The obit might also tell you where she is buried. Hopefully it will also provide more info about her life and you can find the Census info for her. Successful Searching!